Gas-engine.



S. LAWSON.

GAS ENGINE.

APPLICATION FILED nov. 1. me.

Patented Oct 16, 1917.

. Ma Q, w m av fin .wm we N Q 0. .QN 9N S s mw I L MN M lllillll-lllll N mm IN VE N TOR WITNESS SAM GEL LAWSON, F CBO'ION-ON-HUIDSON, NEW YORK.

GAS-ENGINE.

Specification of Letters Patent. Patented @ct. 16, 191'? Application filed November 1, 1916. Serial No. 128,849.

To all whom it may concern:

Be it known that I, SAMUEL LAWSON, a

citizen of the United States, residing at Croton-on-Hudson, in the county of Westchester and State of New York, have invented an Improvement in Gas-Engines, of which the following is a specification.

This invention relates to a gas engine, and more particularly to the construction and arrangement of the valves employed in connection therewith. In gas engines as now commonly constructed, it is quite general to provide separate and distinct intake andexhaust valves for the separate and distinct intake and exhaust ports, irrespective of whether the valves employed are of the puppet-valve type, or the slide-valve type,

or the sleeve-valve type. This practice has been deemed necessary due to properly timing the valve to provide for the required period when the intake port is open for a full charge of the combustible fuel, and when the exhaust port is open, for a complete discharge of the products of combustion.

In carrying out my invention, I employ with each cylinder of an explosive engine,

a single and therefore a common intake and exhaust port, as well as a single valve having intake and exhaust passages therein, and a sleeve device or other similar means 00- acting with the valve and actuated thereby for retarding the closing of the port in the cylinder to insure a full charge of the combustible fuel and a complete discharge of the productsof combustion. I also employ suitable means for actuating the valve, and may employ an auxiliary exhaust port in the cylinder together with a suitable valve for opening the same at the beg nning of the exhaust stroke or the piston to insure, 1n 1nstances where the same is necessary, a complete discharge of the products of combustion.

The gas engine structure comprising my present invention, will be hereinafter more particularly described,,in conjunction with the accompanying drawings, in which' Figure 1 is a central longitudinal cross section.

Fig. 2 is a partial sectional plan on the line 2, 2, ofFig. 1.

Fig. 3 is an elevation of the valve and sleeve employed therewith, and Fig. 4 is a cross section on line 4, 4, F1g.3. Referring more particularly to the drawing, the gas engine comprising my invention includes as is usual, 3, cylinder having a water jacket 11 and provided with a cylinder head 12. Within the cylinder is a pis-. ton 13 provided with any suitable packing rings 14, and a connecting rod 15, which at one end is connected to the piston by a rod pin 16 or otherwise, and at the opposite end to a crank on the drive shaft.

As illustrated, the engine cylinder may be provided with a flange 17 adapted to abut against a flange 18 provided for this purpose on a valve case 19 which is connected to the cylinder by suitable bolts or otherwise. The valve case 19 is also provided with a water jacket indicated at 20. in the valve case 19 is an intake port 21 provided with an intake connection 22 leading to any suitable source of fuel. The valve case 19 is furthermore provided with an exhaust port 23 in which there is secured an exhaust connection 24. The outer or upper end of the valve case is fitted with a cap 25, in which there may be an opening 26 adapted to receive an oilcup, it being understood that the cap is not a closed structure, as it will be preferable to have the ends of the valve case open.

Within the valve case 19 is a valve 27. At its lower or inner end 28, the valve 27 is of substantially the same diameter as is the bore in the valve case, so that this portion of the valve fits and slides within the case. At this end the valve is slotted and provided with a pin 29, to which one end of the valve rod 30 is connected, it being understood that the valve rod is moved to actuate the valve by a suitable crank shaft, eccentric, or other similar mechanism. In the other end of the valve, which is of reduced diameter, there is a transverse passage 31 and between the same and the inner or lower end of the valve there is a longitudinal passage 32 terminating in ports or openings in opposite sides of the valve, the outer or upper portion of the valve being of reduced diameter, providing a shoulder 33. Between those portions of the valve having diiierent diameters, and surrounding the reduced portion of the valve I employ a split sleeve 34. This split sleeve is appreciably shorter than the reduced portion of the valve, and in the movements of the valve, is adapted to permit the reduced end of the valve to slide within the sleeve in theu'pward movement until the lower or inner end of the split sleeve contacts with the shoulder 83 and in the downward moveill ill

ment of the valve until the upper or outer end of the split sleeve contacts with a plate 35 secured to this end of the valve by a suitable bolt 36 and nut 37 or otherwise. In the split sleeve there are ports 38 and 39 adapted to register with the intake port 21 in the valve case, and also with the port 4:0 extending through the opposite side of the valve case and into the upper or outer end of the engine cylinder, so that a straight passage is provided for the intake through these ports and through the passage 31 in the valve. The split sleeve 34, adjacent itslower inner end is provided with an exhaust port ll.

1 may also provide the engine cylinder with an exhaust port 42 and fit the same with a suitably actuated valve d3 and a pipe connection 44 extending between the same and the exhaust connection 2%, for the pub poses hereinafter described.

it will be noted that the dimension of the passage 31 longitudinally of. the piston, is appreciably greater than the corresponding dimensions or the ports 38 and 89, as well as of the o fice or the intake port 21 and the port 40, this difference being substantially equal. to the difference in length between he reduced portion of the valve and the ength of the split sleeve; consequently as will be understood by reference to Fig. l, after the valve has been opened to its full extent as shown in this figure and the valve is moved upwardly to close the intake ports, stationary until the lower or inner end thereof is brought into contact with the shoulder 33, whereupon in the continued outward or upward movement of the valve, the split sleeve is moved with the valve and due to the difference in the dimensions or the ports and passage 31 longitudinally of the valve,

the valve will remain open appreciably longer than would be the case were these ports and passages of the same dimensions, thus insuring a full charge or the combustible fuel being drawn into the engine cylinder.

The same condition maintains in regard to the exhaust, in view of the fact that the port longitudinally of the valve is greater in diameter than the inner opening in the exhaust passage and the outer opening in the exhaust passage is of correspondingly greater dimensions longitudinally of the valve than the orifice of the discharge port 23, so that in closing the valve, the same descends until the split sleeve contacts with t is plate 35, after which in this movement of the valve, the split sleeve moves therewith and consequently the exhaust ports remain open for a materially longer period than they would were these ports and the exhaust passage of the same dimensions.

As a relief exhaust and as hereinbefore the split sleeve will remain.

stated, 1 may provide the exhaust port 42 in the engine cylinder. This is uncovered by the piston when in its lower or innermost position and the valve 43 is opened by a suitable mechanism at the beginning 01 I the exhaust stroke in order to relieve the main exhaust ports and passages of the complete discharge of the products of combustion.

I claim as my invention:

1. In a gas engine and in combination, a cylinder having a common intake and exhaust port, a piston in the cylinder, a valve having intake and exhaust passages adapted to register with the port in the cylinder, and unitary means co-actiug with the valve for retarding the closing of the intake passage and also the exhaust passage therein.

2. in a gas engine and in combination, a cylinder having a common intake and are haust port, a piston in the cylinder, a valve having intake and exhaust passages adapted to register with the port in the cylinder, and unitary means co-acting with and ac tuated by the movement of the said valve for retarding the closing of the intake passage and also the exhaust passage therein.

3. in a gas engine and in combination, a cylinder having a common intake and ex haust port, a piston in said cylinder, a valve cas a valve therein having intake and exhaust passages, and a sleeve coacting with the said valve to retard theclosing of the intake passage and also the exhaust passage therein.

4. in a gas engine and in combination, cylinder having a common intake and exhaustport, a piston in said cylinder, a valve case, a valve having a transverse passage and a longitudinal passage therein, a sleeve fitting over a portion of the said valve and having ports therein whereby the closing of the passages in the valve is retarded the coaction of the sleeve with the valve.

5. In a gas engine and in combination, a cylinder having a common intake and exhaust port, a piston in said cylinder, a valve case, a valve having a transverse intake passage and a longitudinal exhaust passage and one end of the valve being of reduced diameter, and a sleeve fitting the reduced end of the valve and provided with intake and exhaust ports and coacting with the valve to retard the closing of the intake and exhaust passages therein.

6. In a, gas engine and in combination, a cylinder having a common intake and exhaust port, a piston in said cylinder, an open ended valve case, a valve therein having a transverse intake passage and longitudinal exhaust passage terminating in opposite sides or the valve, the said valve being adapted at one end to fit and move within the valve case and at the other end being of reduced diameter, there being a shoulder provided between the parts of the valve of diiierent diameters, a split sleeve fitting the end of the valve of reduced diameter and being of appreciable shorter length than the end of the valve of reduced diameter, a plate fixed to the end of the valve of reduced diameter and by which and the said shoulder the sleeve is caused to move with the valve to retard the closing of the intake and exhaust passages in the valve.

7. In a gas engine and in combination, a cylinder having a common intake and exhaust port and also an auxiliary exhaust port, a piston in said cylinder, an open ended valve case, a valve therein having a transverse intake passage and longitudinal exhaust passage terminating in opposite sides of the valve, the said valve being adapted at one end to fit and move within the valve case and at the other end being of reduced diameter, there being a shoulder provided between the parts of the valve of difierent diameters, a split sleeve fitting the end of the valve of reduced diameter and being of appreciable shorter length than the end of the valve of reduced diameter, a plate fixed to the end of the valve of reduced diameter and by which and thesaid shoulder the sleeve is caused to move with the valve to retard the closing of the intake and exhaust passages in the valve, and a valve for opening and closing said auxiliary exhaust port.

Signed by 1916.

me this 30th day of October,

SAMUEL LAWSON. 

